Download Ortiz 9.2 and 9.4 Notes

Ortiz 9/2 and 9/4
Vocabulary
Variable:
A letter (lower case) such as x or y, which represents an unknown number.
Ex: If x represents Emilyʼs age, then x+5 represents the age of Emilyʼs brother who…
Coefficient:
A number in front of a variable, 5 is the coefficient in the expression 5x+6. The 5 is …
Exponent: (POWER)
The little number above and to the right of a _______ number. It means to multipl…
Ex: 52 2 is the exponent. It means multiply 5 times 5.
53 3 is the exponent. It means multiply 5 times 5 times 5
Base:
The Number to which to exponent is attached.
Ex: 52 5 is the base number.
Terms:
a. are numbers
b. are variables
are a combination of a and b
Which are separated by mathematical signs (+ or - )
Ex: xy 1 term
x+y 2 terms
Terms can be added or subtracted IF AND ONLY IF:
They have the same variable
They have the same exponent
***Really just combining coefficients
5x2+ x2= 6x2 (5 x squared plus x squared = 6 x squared) Maybe think of it as an ac…
Expression:
Does not have an equal sign.
x= Emilyʼs age
x+5
5 equals how much older her bother is (5 years older)
Constant:
The number in an expression or equation which does not change. The 5 above in …